A selective coordination approach is more restrictive and tends to provide a more reliable system.

A selective coordination approach is more restrictive and tends to provide a more reliable system.

• A. True
• B. False
• C. Not specified
• D. Sometimes

Answer: (A)

Selective coordination means protective devices are arranged so that only the device closest to a fault trips. Because of this, the system requires careful alignment of time-current characteristics and device settings across multiple devices, which makes it more restrictive to design and maintain. That restrictiveness, however, pays off in reliability: faults are isolated to the smallest possible portion of the system, so the rest of the system continues to operate and only the problematic section is disconnected. In short, the approach prioritizes dependable operation and minimal disruption, making the statement true.

Selective coordination means protective devices are arranged so that only the device closest to a fault trips. Because of this, the system requires careful alignment of time-current characteristics and device settings across multiple devices, which makes it more restrictive to design and maintain. That restrictiveness, however, pays off in reliability: faults are isolated to the smallest possible portion of the system, so the rest of the system continues to operate and only the problematic section is disconnected. In short, the approach prioritizes dependable operation and minimal disruption, making the statement true.